Re: [PATCH 2/3] irqchip/gic-v5: Allow for nr_irqs > 1 for LPI alloc and teardown

[Sascha Bischoff <Sascha.Bischoff@arm.com>]

On Tue, 2026-05-05 at 22:08 +0200, Thomas Gleixner wrote:
> On Thu, Apr 30 2026 at 15:34, Sascha Bischoff wrote:
> > Formerly the LPI allocaion and freeing was handled by the domains
> > built on top of the LPI domain, and hence the LPI to use was passed
> > in
> > from the child domain. This mandadated that LPI allocation and
> > freeing
> > was done one at a time, rather than for a range of interrupts in
> > one
> > go.
> > 
> > Now that the underlying restriction has been removed and all LPI
> > tracking happens within the LPI domain itself, drop the requirement
> > to
> > allocate and free LPIs one-by-one.  While we're at it, clean up the
> > IPI allocation to request all LPIs in one go, rather than
> > requesting
> > them one at a time.
> > 
> > Incidentally, this fixes a unwind bug for IPIs where previously
> > allocated entries were not unwound on a failed parent allocation.
> 
> See previous reply

Have re-worded this.

> 
> > Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
> > ---
> >  drivers/irqchip/irq-gic-v5.c | 70 +++++++++++++++++++-------------
> > ----
> >  1 file changed, 38 insertions(+), 32 deletions(-)
> > 
> > diff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-
> > gic-v5.c
> > index a3c9eaa8ff486..61a70fe48bc32 100644
> > --- a/drivers/irqchip/irq-gic-v5.c
> > +++ b/drivers/irqchip/irq-gic-v5.c
> > @@ -800,17 +800,16 @@ static void gicv5_irq_lpi_domain_free(struct
> > irq_domain *domain, unsigned int vi
> >  				      unsigned int nr_irqs)
> >  {
> >  	struct irq_data *d;
> > +	int i;
> >  
> > -	if (WARN_ON_ONCE(nr_irqs != 1))
> > -		return;
> > -
> > -	d = irq_domain_get_irq_data(domain, virq);
> > -
> > +	for (i = 0; i < nr_irqs; i++) {
> 
>         for (unsigned int = 0; ....
> 
> > +		d = irq_domain_get_irq_data(domain, virq + i);
> 
>   s/virq/ and then make
>   
>         for (unsigned int = 0; ....; i++, virq++)

Done.

> 
> >  static int gicv5_irq_lpi_domain_alloc(struct irq_domain *domain,
> > unsigned int virq,
> > @@ -818,32 +817,38 @@ static int gicv5_irq_lpi_domain_alloc(struct
> > irq_domain *domain, unsigned int vi
> >  {
> >  	irq_hw_number_t hwirq;
> >  	struct irq_data *irqd;
> > -	int ret;
> > -
> > -	if (WARN_ON_ONCE(nr_irqs != 1))
> > -		return -EINVAL;
> > +	int ret, i;
> 
> unsigned int i;

Done.

> 
> >  static const struct irq_domain_ops gicv5_irq_lpi_domain_ops = {
> > @@ -871,11 +876,11 @@ static int gicv5_irq_ipi_domain_alloc(struct
> > irq_domain *domain, unsigned int vi
> >  	struct irq_data *irqd;
> >  	int ret, i;
> >  
> > -	for (i = 0; i < nr_irqs; i++) {
> > -		ret = irq_domain_alloc_irqs_parent(domain, virq +
> > i, 1, NULL);
> > -		if (ret)
> > -			return ret;
> > +	ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
> > arg);
> > +	if (ret)
> > +		return ret;
> >  
> > +	for (i = 0; i < nr_irqs; i++) {
> 
>   for (unsigned int i ....

And done.

> Thanks,
> 
>         tglx

Version 2 incoming.

Thanks,
Sascha